- From: Ivan Herman <ivan@w3.org>
- Date: Tue, 27 Nov 2007 17:35:57 +0100
- To: Ian Horrocks <ian.horrocks@comlab.ox.ac.uk>
- Cc: ewallace@cme.nist.gov, boris.motik@comlab.ox.ac.uk, public-owl-wg@w3.org
- Message-ID: <474C476D.9090800@w3.org>
Ian Horrocks wrote: > I agree that the kind of example put forward by Jeremy For the records: I put forward almost the same example independently of Jeremy. Blame me, not him:-). We both happened to refer to an existing community: the Dublin Core, more generally the library community. > may be considered > "bad modelling" -- it is surely not intended that a string is the > creator of anything. What probably is intended is that the creator is > some object (so dc:creator would be an object property), and that object > may have a name (typically a string accessed via a datatype property). > Actually... Jeremy indeed referred to dc:creator, I referred to dc:subject. The latter is a bit different: one can use a subject as a simple string ("Computer Science") or refer to some sort of a formal classification system of subjects defined, say, as a SKOS definition, in which case the object for the dc:subject is a SKOS concept. I can see a casual user of that property to switch between those two types of objects... > I don't mean to imply that no "good" example exists, I guess that is the important point. We should not go too deeply into the particulars of DC. > or that it is > reasonable to ignore requirements deriving from what we believe to be > misuse of the language ;-) > :-) Ivan > Ian > > > > On 27 Nov 2007, at 15:28, ewallace@cme.nist.gov wrote: > >> >> >> Ivan Herman wrote: >>> Well... I did meet one example. DCMI (the organization behind the Dublin >>> Core metadata) is having problems exactly on that. They have an abstract >>> model document[1] where they speak about 'value surrogate' that can >>> either be a literal or non-literal. When mapping this abstract model to >>> RDF[2] they hit this problem (eg, is the value of a dcterm:subject >>> property a literal or not). >> >> I personally think that this example illustrates plain bad modelling >> practice. Can you point to some discussion of the motivations for this >> choice which might modify my view? >> >> -Evan >> > -- Ivan Herman, W3C Semantic Web Activity Lead Home: http://www.w3.org/People/Ivan/ PGP Key: http://www.ivan-herman.net/pgpkey.html FOAF: http://www.ivan-herman.net/foaf.rdf
Received on Tuesday, 27 November 2007 16:36:05 UTC